If it was in fact, ich, then she needs to complete the 10 day treatment. Otherwise it's going to come right back and she'll be in the same spot. 10 days of salt shouldn't hurt those fish. I 100% agree with the fresh water, there's almost nothing it won't cure-except ich

Do the water changes, but my suggestion is to salt the replacement water.
Zbbal, I agree with you-the 2nd most important thing next to water changes is a test kit. I've had a few dozen tanks for years and I check mine all the time.Random ammonia and nitrites tests, but nitrates pretty regularly. It's one of the best investments you can make. I want to know if I have a problem
before the fish start getting sick.